Saturday, 25 May 2013

Great flare in AR11748

AR11748 hosting an X3 flare - and its aftermath. The sketches show flare ribbons and flare loops ( the brightest parts of a flare arcade) the latter developing into an unusually compact cluster of post flare loops above the Sun's NE limb. Dates and times are UT. The spot group was, it seems, much reduced as a result of the weakened umbral fields of SC24. The event was sited at lat. +12, long. 290. A particularly elegant display though it rose only ~40Mm above the limb during the session.

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